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|I had a problem with my ignition switch as well. It was not making reliable contact so the engine would misfire sometimes. The switch has two screws holding it to the mechanical switch, so it comes off fairly easily. I took mine apart and cleaned up the contacts and got a couple more years use out of it, but ultimately ended up replacing it with a homemade electronic switch similar to what is used on new cars which do not have key switches any more. If you understand electronics are good enough with a soldering iron, I could provide the details (it is a simple circuit). Keep in mind, though, that the reliability of a custom circuit depends on how well it is assembled and installed.
You might check with Delta to see if they still can get replacements or try to get a used one from British masters which is in better shape than the one you have.